This performance still takes my breath away every time I rewatch it. It was also the symbol of the start of their era's great fame. Truly like a miracle through and through, kicking off the popularity of the series and the franchise up to this day. What I really loved about it was the performance itself. It was different from the PV (if you've seen it), especially the iconic miracle orange lights on the bridge of the song. I also loved each of their monologues right before the song started. The animation was also at its peak on this performance. They were definitely quite far along in the animation in the mid 2000s. That said, I also loved the little moments they each had: the first years and third years, showing us how much they've grown closer, too. God, it still makes me tear up to this day.